statsmodels.genmod.families.links.NegativeBinomial.inverse_deriv¶

NegativeBinomial.inverse_deriv(z)[source]¶

Derivative of the inverse of the negative binomial transform

Parameters:¶

zarray_like

Usually the linear predictor for a GLM or GEE model

Returns:¶

g^(-1)’(z)ndarray

The value of the derivative of the inverse of the negative binomial link